/*!

\if MANPAGES
\page dcmp2pgm Read DICOM image and presentation state and render bitmap
\else
\page dcmp2pgm dcmp2pgm: Read DICOM image and presentation state and render bitmap
\endif

\section dcmp2pgm_synopsis SYNOPSIS

\verbatim
dcmp2pgm [options] dcmimage-in [bitmap-out]
\endverbatim

\section dcmp2pgm_description DESCRIPTION

The \b dcmp2pgm utility renders a monochrome DICOM image under the control of
a grayscale softcopy presentation state object into a monochrome bitmap
with 8 bits/pixel.  The bitmap is stored either as "Portable Gray Map" (PGM)
or as a DICOM secondary capture image object.  If no presentation state is
read from file, a default presentation state is created.  The utility allows
one to read a configuration file of the Softcopy Presentation State Viewer upon
startup.  In this case, the settings from the configuration file affecting
the rendering of the presentation state are used, e.g. a correction of the
gray scale range according to Barten's model (DICOM part 14) can be
performed if the characteristic curve of the display system is available
and defined in the configuration file.

\section dcmp2pgm_parameters PARAMETERS

\verbatim
dcmimage-in  input DICOM image ("-" for stdin)

bitmap-out   output DICOM image or PGM bitmap
\endverbatim

\section dcmp2pgm_options OPTIONS

\subsection dcmp2pgm_general_options general options
\verbatim
  -h   --help
         print this help text and exit

       --version
         print version information and exit

       --arguments
         print expanded command line arguments

  -q   --quiet
         quiet mode, print no warnings and errors

  -v   --verbose
         verbose mode, print processing details

  -d   --debug
         debug mode, print debug information

  -ll  --log-level  [l]evel: string constant
         (fatal, error, warn, info, debug, trace)
         use level l for the logger

  -lc  --log-config  [f]ilename: string
         use config file f for the logger
\endverbatim

\subsection dcmp2pgm_processing_options processing options
\verbatim
  -p   --pstate  [f]ilename: string
         process using presentation state file

  -c   --config  [f]ilename: string
         process using settings from configuration file

  -f   --frame  [f]rame: integer
         process using image frame f (default: 1)
\endverbatim

\subsection dcmp2pgm_output_format output format
\verbatim
  -D   --pgm
         save image as PGM (default)

  +D   --dicom
         save image as DICOM secondary capture
\endverbatim

\subsection dcmp2pgm_output_options output options
\verbatim
  +S   --save-pstate  [f]ilename: string
         save presentation state to file
\endverbatim

\section dcmp2pgm_notes NOTES

\subsection dcmp2pgm_limitations Limitations

Please note that the \b dcmp2pgm tool does not render all aspects that are
defined by the Grayscale Softcopy Presentation State (GSPS) object but only
those that are supported by the underlying DCMTK classes.  In particular,
textual and graphical annotations will not be visible in the output image.
The reason is that these aspects of a GSPS object are typically rendered by
DICOMscope, the graphical user interface that is put on top of the related
DCMTK classes and written in Java.

Also concepts that were introduced after the initial definition of the GSPS
IOD (see Supplement 33) are ignored.  This includes Supplement 120 with its
extended features like e.g. Compound Graphics.

\section dcmp2pgm_logging LOGGING

The level of logging output of the various command line tools and underlying
libraries can be specified by the user.  By default, only errors and warnings
are written to the standard error stream.  Using option \e --verbose also
informational messages like processing details are reported.  Option
\e --debug can be used to get more details on the internal activity, e.g. for
debugging purposes.  Other logging levels can be selected using option
\e --log-level.  In \e --quiet mode only fatal errors are reported.  In such
very severe error events, the application will usually terminate.  For more
details on the different logging levels, see documentation of module "oflog".

In case the logging output should be written to file (optionally with logfile
rotation), to syslog (Unix) or the event log (Windows) option \e --log-config
can be used.  This configuration file also allows for directing only certain
messages to a particular output stream and for filtering certain messages
based on the module or application where they are generated.  An example
configuration file is provided in <em>\<etcdir\>/logger.cfg</em>.

\section dcmp2pgm_command_line COMMAND LINE

All command line tools use the following notation for parameters: square
brackets enclose optional values (0-1), three trailing dots indicate that
multiple values are allowed (1-n), a combination of both means 0 to n values.

Command line options are distinguished from parameters by a leading '+' or '-'
sign, respectively.  Usually, order and position of command line options are
arbitrary (i.e. they can appear anywhere).  However, if options are mutually
exclusive the rightmost appearance is used.  This behavior conforms to the
standard evaluation rules of common Unix shells.

In addition, one or more command files can be specified using an '@' sign as a
prefix to the filename (e.g. <em>\@command.txt</em>).  Such a command argument
is replaced by the content of the corresponding text file (multiple
whitespaces are treated as a single separator unless they appear between two
quotation marks) prior to any further evaluation.  Please note that a command
file cannot contain another command file.  This simple but effective approach
allows one to summarize common combinations of options/parameters and avoids
longish and confusing command lines (an example is provided in file
<em>\<datadir\>/dumppat.txt</em>).

\section dcmp2pgm_environment ENVIRONMENT

The \b dcmp2pgm utility will attempt to load DICOM data dictionaries specified
in the \e DCMDICTPATH environment variable.  By default, i.e. if the
\e DCMDICTPATH environment variable is not set, the file
<em>\<datadir\>/dicom.dic</em> will be loaded unless the dictionary is built
into the application (default for Windows).

The default behavior should be preferred and the \e DCMDICTPATH environment
variable only used when alternative data dictionaries are required.  The
\e DCMDICTPATH environment variable has the same format as the Unix shell
\e PATH variable in that a colon (":") separates entries.  On Windows systems,
a semicolon (";") is used as a separator.  The data dictionary code will
attempt to load each file specified in the \e DCMDICTPATH environment variable.
It is an error if no data dictionary can be loaded.

\section dcmp2pgm_files FILES

<em>\<etcdir\>/dcmpstat.cfg</em> - sample configuration file

\section dcmp2pgm_copyright COPYRIGHT

Copyright (C) 1998-2023 by OFFIS e.V., Escherweg 2, 26121 Oldenburg, Germany.

*/
